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Table 6 Correlations between melatonin, glucose, insulin, GH, IGF-1 and leptin mean levels during the two 24 h periods and the beginning, end and duration of the previous or following winter ovarian inactivity.

From: Effects of nutritional cues on the duration of the winter anovulatory phase and on associated hormone levels in adult female Welsh pony horses (Equus caballus)

  2nd ovulatory winter inactivity 3rd ovulatory winter inactivity
  Beginning End Duration Beginning End Duration
Melatonin -0.37
P < 0.05
NS NS NS NS NS
Glucose 0.69
P < 0.0001
-0.60
P < 0.01
-0.67
P < 0.0001
0.60
P < 0.001
-0.60
P < 0.001
-0.68
P < 0.0001
Insulin 0.54
P < 0.001
-0.57
P < 0.01
-0.60
P < 0.001
0.45
P < 0.05
-0.61
P < 0.001
-0.62
P < 0.001
GH -0.82
P < 0.0001
0.62
P < 0.001
0.78
P < 0.0001
-0.71
P < 0.0001
0.59
P < 0.001
0.72
P < 0.0001
IGF-1 NS NS NS NS NS NS
Leptin 0.60
P < 0.001
-0.63
P < 0.001
-0.67
P < 0.0001
0.58
P < 0.001
-0.68
P < 0.0001
-0.73
P < 0.0001
  1. (Not Significant: NS; number of observations: 29).